Re: [libvirt-users] virsh dump
On 08/10/2012 05:31 PM, Harish Patil wrote:
Hi
I have both host and KVM/QEMU guest VM running linux.
Questions:
What are the constituents of the virsh dump?
- What all areas does it dumps?
By default, it dumps in the same format needed to migrate a VM from one
host to another. As of 0.9.13 and new enough qemu (basically, a feature
in qemu.git but not released until the upcoming qemu 1.2), you can also
use 'virsh dump --memory-only' to force a dump to an ELF image instead.
- Is it same as taking guest VM's core dump via kexec/kdump?
If you use the --memory-only option, then it is very similar (although
the dump is performed without guest involvement). If you want an actual
kexec/kdump from the guest, then you'll have to have the guest create
that; it may be worth requesting a qemu-ga guest agent command to
trigger a guest to dump itself.
- Does it include QEMU's info to debug qemu-level issues?
No, it is not a core dump of the qemu process itself.
--
Eric Blake eblake(a)redhat.com +1-919-301-3266
Libvirt virtualization library http://libvirt.org
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